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    Home > Coatings News > Paints and Coatings Market > Paint knowledge: preparation before house painting

    Paint knowledge: preparation before house painting

    • Last Update: 2020-04-03
    • Source: Internet
    • Author: User
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    Core tip: if you are lucky enough, your house may only need a good cleaning before repainting You can wash the house with a hose and carefully remove the grime with a board brush and warm soapy water Or flush it with a high-pressure water gun If you are not so lucky, then this dirty and time-consuming cleaning work is in front of you, and you have to face this reality If you do a good job, your painted house will not only look more beautiful, but it will remain beautiful for an average of five to eight years The first thing to do is to have a thorough examination of the exterior of the house or the outhouse Shenyang steel structure fireproof coating construction expert punde Building Fire Engineering Co., Ltd Recommended introduction: since its establishment, Shenyang punde Construction Fire Engineering Co., Ltd has cultivated a group of professional construction teams with excellent equipment, rich experience and serious responsibility with advanced and scientific management methods and strict engineering quality assurance and after-sales service system It has undertaken a number of fire system installation projects, which has been praised by customers Every idea and special requirement of you will be fully considered by us and fully realized in the construction technology, which will become the cornerstone of our successful long-term development We are looking forward to your invitation, to provide you with quality services and high-quality technical support! All construction coatings have passed ISO9001 Paint House News: if you are lucky enough, your house may only need a good cleaning before repainting You can wash the house with a hose and carefully remove the grime with a board brush and warm soapy water Or flush it with a high-pressure water gun If you are not so lucky, then this dirty and time-consuming cleaning work is in front of you, and you have to face this reality If you do a good job, your painted house will not only look more beautiful, but it will remain beautiful for an average of five to eight years The first thing to do is to have a thorough inspection of the exterior of the house or outhouse - not only the exterior walls, but also the eaves, doors and windows, and the edges of the foundation Look for cracks in roof and siding, nails coming out, paint peeling or blistering, mildew and rust Once you find areas that need attention, repair them Remove small areas of soiled paint with wire brush or wide mouth putty knife Wipe the lower surface of the overlapping part of the wall panel and the upper surface of the downpipe and gutter Scrape off small areas of soiled paint with a wire brush and a wide putty knife Wipe the lower surface of the overlapping part of the wall panel and the upper surface of the downpipe and gutter In order to speed up the scraping on the metal surface, you can use the wire brush accessories on the electric drill, which can remove rust and paint more effortlessly If you want to remove a larger area of paint, you can buy a sharp pull type paint scraper, which is a tool that can replace the blade, and you can go deep into the old paint and scrape the bare wood as soon as the blade goes down When using, you should hold the paint scraper, make the blade perpendicular to the wood, apply appropriate pressure or compression, and then pull along the paint surface Keep the blade flat against the wood to avoid scratching the surface To smooth the edges of the scratches, you can use a piece of sandpaper to polish the whole board If you want to polish a larger area, a more labor-saving and effective way is to use an electric rail sander Let it move up and down or back and forth along the wood surface, so that the old paint can be removed and the burr can be flattened at the same time But do not use electric disc sander or belt sander These two Sanders leave swirling or grooved marks on the wood, which are still faintly visible through the new coating Melting may have a greater effect on coatings that have been deposited in a particularly thick layer than extrusion One way of heating is to use an electric paint remover, which is a device with a disk-shaped heating element, which can "burn" the paint and has a paint scraper built-in, which can peel off the paint You need to wear thick gloves, hold the heating element and keep it close to the paint surface until the paint sizzles Then, compress the paint remover and pull it along the paint surface In this way, the paint scraper attached when pulling will peel off the burnt paint Liquid paint remover liquid paint remover should only be used as a last resort They work well, but they are expensive, especially when used on a large scale In addition, they may be splashed on the perfect paint, which brings you a problem to solve Primer after all loose paint has been removed, you should apply a suitable primer to some damaged areas, especially when the paint remover has exposed logs or bare metal Which primer should be used depends on the type of paint you want to use later If it is emulsion paint, it is better to use emulsion primer; if it is solvent based paint, it is better to use solvent based paint; if it is metal paint, it is better to use metal primer These coatings can not only provide additional protection for the wall from the damage of the surrounding environment, but also form a solid base of top coat In addition, if it is painted on new wood, the whole process needs to use primer Other preparatory work even if you are very lucky, you can save the tedious work of scraping, sanding and repainting There are still some chores you need to take care of before painting Although they are far less laborious than removing peeling paint, they still play an equally important role in successful painting The rust on the siding, cornice and foundation needs to be removed The cracks in the gutter and downpipe must be repaired The loose filler and cracked roof slab should also be replaced The cracks in the wall panel must be filled, polished and primed The mildew on the wall must also be scraped off If necessary, some measures must be taken to completely eradicate it In addition, for the convenience of painting, the external heavy windows, screens, blinds, awnings, lamps installed on the wall (the power must be turned off), mailbox and even door number should be removed, cleaned and painted separately You may even need to remove the downpipes, because sometimes it's hard for the paintbrush to reach behind them Usually you need a day or a weekend to do all these preparations for a complete house If you're painting a hallway or an outhouse, it may take only an hour If you paint with latex paint, you can start the next day Solvent based coatings do not adhere well to wet surfaces, so you should wait until all cleaned surfaces are completely dry before applying this type of coating Cleaning this process will not only clean the exterior of the house, provide a spotless substrate for the new coating, but also help you find cracks in the wall that need to be treated There are two ways to get started with this work, but which one depends on the degree of dirt on the exterior and the size of the house If you live in a medium-sized house, you should use a garden hose with a car wash accessory to wash large areas In addition, a bucket of warm water with high quality and strong household detergent should be added Generally speaking, it is to clean from top to bottom, and all areas that have been cleaned with water shall be rinsed once If the house is large or you want to speed up the cleaning of smaller houses, you can rent a high-pressure spray washer This equipment is directly connected to your water supply system, and the water pressure is about 4134 kPa It has a handle, the tip of which is a nozzle opened by a trigger Such high water pressure is not only enough to wash away the stubborn scale, mildew and salt splashed on the house by the sea, but also enough to wash away the peeling paint In fact, if the nozzle is too close to the surface, it may even peel off good paint, split the roof slab, and punch holes in the siding Therefore, you should wear goggles and protective clothing according to the manufacturer's instructions You can use the spray washer on the ladder Although it is better on the scaffold, it is better to use it on the ground Because if you use it carelessly, the impact of the spray on the house may push you down the ladder Some of these machines have separate containers that can be used to hold cleaning or mildew resistant solutions The power of the jet washer is strong, so it is usually unnecessary to use cleaning fluid But if you do, don't forget to wash the surface with water later After nailing the emerging nails back to wash the house, you may see some nails emerging from the wall panel or rusty nail heads that have left rust spots on the exterior wall If this is the case, you should use sandpaper or steel wool to clean the nail heads On the wall of the wall panel, nail the nail head into the wood with a nail punch about 0.3cm Apply a thin coat of anti rust primer (unless nails are aluminum or galvanized stainless steel) and dry Then fill the nail hole with plastering powder or putty After the packing has dried, apply a coat of primer For flat head nails that cannot be driven in, the nail head shall be polished and applied with a layer of primer Covering shrubs, shrubs and ornamental shrubs may also hinder painting Therefore, you should cut off any branches that hang on the house or touch the wall The holly trees and tall shrubs growing near the house can be wrapped in canvas, and then one end of the rope is tied above the middle of the trunk Pull the branches out of the house and tie the other end of the rope to a stake that is driven further out into the yard Next, cover smaller shrubs, flower beds, sidewalks and driveways with coverings to prevent paint from dripping and splashing on them Estimating the amount of paint required the size of the house, the condition of the surface, the type of coating selected, and the method of application are all factors that determine the amount of paint you need to buy The amount of paint required for narrow lap siding, roof slab or thick cover plate, masonry and plaster external walls is 10% to 50% more than for smooth and flat walls Airless spray machine can spray coating equivalent to two coatings at a time Compared with paint brush, roller or paint brush, the same area of wall may need twice of coating If you run out of paint, you can buy a more standard premixed paint Or, if you buy too much paint, you can take the unopened barrels of paint to the store for return, and many stores can allow refund If it is on credit, it can be returned to these stores without paying the corresponding fee However, for custom color coatings, if there is a shortage, it may be difficult to get the same coating Therefore, you need to carefully calculate the quantity you need, and for the sake of insurance, you should buy one more barrel If you want to determine the amount of paint required for your house, you can measure the perimeter of the house Then multiply this number by the height of the room without the gable end You can use a steel tape to measure, or you can go around the house to draw out the rope in the ball, mark the head and tail, and then measure the length of the rope If the house is decorated with other paints, 2 square meters shall be subtracted from each door and 1.4 square meters shall be subtracted from each ordinary window And then, with
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